Would a 26" barrel on a 30-06 provide extra fps or would the extra 2 inches be a wasted attempt to try to gain some extra velocity?
Has anyone used a 30-06 with a barrel longer than 24 inches with great success in the velocity dept.?
.............What is more important, is that you know the velocities and trajectories from your rifle whether using a 22" a 24" or a 26" barreled `06 just like from any other round. You still must place the shot well "which you`re going to have to do anyway" regardless of tube length. No deer will know the difference after being hit from a 22" 30-06 or one from a 26" barrel.
But if you happen to prefer flatter shooting cartridges just because they are flatter shooters, then a 264 WM, a 270 WSM or the 7RM are very good choices for open terrains assuming your hunting takes you there.